A common problem is the recycling of foundry core sand. A mix of sand and plastic resin is a hard compound normally used to create patterns and internal ducts in moulds to be filled with liquid iron.

Until recently all the sand used in this process was simply stored after using , in protected deposits until an economically viable way of recycling could be found. But now sand has become a not so cheap material and depositories are expensive to mantain due to heavy municipal control and taxes.

Over 100 foundries in the US are now recycling core sand.

The beginning of the process is achieved by desintegrating the hard lumps into a free flowing mixture of sand and hard resin. Mavi Maquinas Vibratorias, Sao Paulo , Brazil has developed a special vibratory equipment to take over this part of the process. The so called DZF Desintegrator is a vibratory bowl -shaped screener, with a special internal design to produce maximum grinding force.

Up to 12 t/h of core sand lumps can be ground in to a free flowing product, later to be screened and the resin burnt in a special furnace. The process ends up delivering clean sand.